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You are pulling a box on a frictionless surface with a constant force. You measure the acceleration.

Your friend comes along and pulls in the same direction as you with a force identical to yours.

Which of the following additional changes could be used maintain the acceleration that you measured when you were pulling alone?

Select TWO answers.


Add a mass that is identical to the mass of the box.


Ask the friend to push the box from behind rather than pulling from the front of the box.


Replace the box with one that is less massive.


Ask another friend to pull backward with the same force as your friend is pulling forward.

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